There is an Australian guy called Alex Simmons who is a cycling coach and races at a high level - one of his legs was amputated after a cycling accident a couple of years ago. His blog/website is here: http://alex-cycle.blogspot.com/

If you read his most recent blog entry, he scored higher on a MAP test now than before his amputation!

He is fairly active on many forums (maybe even this one??) - if you get in touch with him he might have some advice.

Hope that helps, good luck!